Metal roll



Patented F eb. 20, 1934 William ,H. Seaman, Hammond, Ind.

No Drawing. Application October 2, 1930 Serial No. 486,042

0 Claims. (01. 80-58) The present invention relates in general to anovel alloy of iron for use in a chilled cast iron roll employed forrolling metal articles and in particular to a chilled iron alloy rollhaving a chill" or a definite chill as it is sometimes called.

One of the objects of the presentinvention is to provide an alloy ironof such character that the hardness of the working depth or chill may beincreased. I

Another object is to provide a novel alloy of iron in which thetoughness of the working depth or chill may be increased.

Another object is to provide an iron alloy which when'cast in chilledroll will increase the amount of work that may be done with it before itis dressed. I

A further object is to provide a novel iron alloy which is easierhandled in casting in a chilled mold and which will give more uniformcharacteristics.

Still another object is to provide a novel iron alloy which isparticularly beneficial in obtaining an iron alloy roll that may besubstituted for a forged steel roll and which will give better resultsin such cases.

There are other objects of my invention which, together with theforegoing, will be described in the detailed specification which is tofollow:

I have ascertained that the addition of molybdenum to a large number ofalloys, having, as

modifying constituents, carbon, manganese, silicon, sulphur, phosphorus,chromium and nickel,

has a very advantageous effect in that with the modifying ingredientsproperly proportioned for any particularly desiredwork it will greatlyincrease its hardness and toughness and that the alloy, when cast in achilled mold, will provide a roll that wears better and has longer life.

The quantity of the product that may be turned out by such aroll isgreatly increased before the 0 roll has to again be dressed, and thealloy itself is easier to handle in casting. Further, an alloy of moreuniform character is obtained in this manner. The proportion ofmolybdenum with the various other modifying elements mentioned is givenbelow and may be proportioned to give alloys of varying characteristicsin a manner well understood by those skilled'in the art To Mn s1 s P CrNi 1 M5 1 2.60 .10 .20 .05 .05 .15 1.25 .15 to to to to to to to to 3.35.40 1.00 .20 .55 1 .05 a 5.00 l .50

forms its well known function of tending to control the hardness, thenickel also having a hardening efiect.

It is to be pointed out that the alloys generally are somewhat similarin character to those disclosed in my (ac-pending application, SerialNo. 449,686, filed May 3, 1930, with the addition of molybdenum. Infact, alloys having the same and ingredients to secure thesame.

'r.o. Mn 81 s P Cr Ni 70to80 to to to to to to to 3.15 .15 .25 .115 .15.25 3.00 80to90 to to to to to to to 00 to 100 3.25 to to to m m to Myinvention may be variously modified without departing from the spiritand scope thereof, as set forth in the appended claims.

I claim:

1. A cast iron alloy chilled roll, the alloy including as modifyingelements carbon from 2.60% to 3.35%, manganese .10% to .40%, chromium.15% to .65%,. nickel 1.25% to 5.00%, and molybdenum insubstantially'the same proportion as the chromium.

2. A cast iron alloy chilled roll, the alloy including as modifyingelements carbon from 2.60% to 3.35%, manganese .10% to .40%, silicon.20% to 1.00%, chromium .15% to .65%, nickel 1.25% to 5.00%, andmolybdenum .15% to 50%.

3. A cast iron alloy chilled roll, the alloy including as modifyingelements carbon from 2.60% -to 3.35%., manganese .10% to 40%, silicon20% to 1.00% to 1.00%, sulphur .05% to 200%, chromium 15% to .65%,nickel 1.25% to 5.00%, and molybdenum .15% to 4. A cast iron alloychilled roll, the alloy including as modifying elements carbon from2.60% to 3.35%, manganese .10% to .410 silicon 20% to 1.00%, sulphur.05% to 200%, phosphorus .05% to chromium 15% to .65%, nickel 1.25% to5,00%, and molybdenum .15% to 50%.

5. A cast iron alloy chilled roll, the alloy including as modifyingelements total carbon 2.60%

'and having molybdenum for increasing the toughness and hardness of thewearing surface in the proportion of .15% to .50%.

7. A chilled. iron alloy roll'having a definite chill and containing ahardening and toughening agent such as carbon and nickel, in an amountwithin certain limits to produce a desired degree of hardness andtoughness, and also containing a chill affecting ingredient such as"silicon in amount between certain limits to cooperate with the amount ofhardening and toughening agent employed and not to exceed 1.0, and also,containing a further hardening agent.

8. A chilled iron alloy roll containing a hardening and toughening agentsuch as carbon and nickel, in amount between certainlimits to secureening and toughening agent such as carbon and nickel, in amount betweencertain limits to give a desired degree of hardness and toughness, andalso containing silicon, manganese, chromiiim and sulphur in amountsbetween certain limits, so that the silicon and manganese will act tocontrol the chill and the chromium and sulphur to givethe desiredqualities in view-of the amount of hardening and toughening agentemployed the silicon being not to exceed 1.0 and the man ganese not toexceed .40 and the chromium not to exceed .65, and also containingmolybdenum to act as a hardening agent in cooperation with the otheringredients.

WIIZJJAM H. SEAMAN.

Ill

